Pneumatic tire.



No. 888,345. PATENTED MAY 19, 1908 H. MUSGLOW & W. A. ROBERTS.

PNEUMATIC TIRE.

APPLICATION FILED JULYZS, 1907.

Fla y/ WITNESSEb: IIVVENTORS j 1 W HAHHVMUJCLOW W/L /AM A R055? T6 s'rnrne PATENT "@FFECEO HARRY MUSCLOW AN D WILLIAM A. ROBE lt'lS, OF VANCOUVER, BRITISH. COLUMBIA, CANADA.

PNEUD'IATIC TIRE Specification of Letters Patent.

Application filed July 23, 1907.

To all whom it may concern:

Be it known that we, HARRY MUscLow and \VIIJLIAM A. ROBERTS, citizens of the Dominion of Canada, residing at Vancouver, in the Province of British Columbia, Canada, have invented a new and useful Improvement in Pneumatic Tires, of which the following is e specification.

This invention reates to an improved inner tube a pneumatic tire such as is used on automobiles or the like.

In vehicles of this class, where any considerable weight is to be sustained, if the inner tube of a tire should be punctured or for any reason-collapse, the tube is apt to be ruined in melting the run home or to where the injury can be attended to.

Attcmpts have previously been made to guard against this injury by furnishing the inner tube with reinforcing core members of various forms that will 0 pose the elastic re-' sistenee of their meteria to com ression at the tread and. prevent collapse or the tube; but such devices have not been satisfactory, as the reinforcing core has been so ap died or attached within the air containing tube that the elastic resistance of the material of the core has been called into play in the noruml use of the tire, and has thus impeded to a greater or less extent the uick elastic action of the compressed air on w rich the success oi a pneumatic tire depends. Under these circumstances the tire instead of beingproperly a pneunurtic one has parteken in its normal use more of the character of a solid rul her or cushion. tire.

Our effort has therefore been to provide a collapse resisting 'core that will not, when properly inflated with air, interfere with the proper action of the pneumatic feature oi the tire, but that will, it the inner air containing tube should be punctured or for other reason lose its air, sustain the inner tube ol" the tire against complete collapse and will furnish the material resistance of a cushion tire to carry the vehicle to a place where the repair can be effected,

The invention is full described in the following speclficat'ion re erc'nco being made to the drawings by which it is accompanied, in which:

Figure 1 is a, vertical cross section of our tire in its simplest form when not inflated, Fig. 2 .fc similar view'x'vhen iniluted, Fig. 3, a longitudinal vertical section showing the preferred form of our tire inflated, and Figs.

-l and 5, cross sections of the same when inflated and when the air is withdrawn respectivoly. I

In these drawings 2 represents the inner or air containing tube of a tire which may be placed within an outer tube or shield of any approved kind, the outer protective covering being immaterial to this application the subjeot matter oi w-luh comprises merely what is known as 1 im .r or air containing tube.

Bound the'inside of the tread portion 5 of the tube 2 and round the inside at 6, diametrically opposite in the tube cross section, are cemented rings 7 and 8 of rubber or other similar material. The dimensions and the confornurtion of these rings are such that when together they correspond approximately to the cross section of the tube 2 when not inflated and except where cemented at 5 and 6, the rings 7 and 8 are free from direct connection with one another or with the tube 2, so that they will not interel'erc with the free dilation and normal compression of the tube at the tread, when the tube is pumped up with air.

"The cemented tread segment 5 is preferably extended through a considerable arc of the cross section so that the tube 2 will be reinforced at that port to prevent a puncture which might penetrate the ou ter covering of the tire.

The core rings 7 and 8 may be provided with an annular core space 12 of any suitable form to impart a greater measure of elasticity.

ln the preferred modification illustrated in Figs. 3, 4 and 5 the rings 7 and 8 are of less Lminimum thickness and their adjacent faces are provided with interorojecting denticulel-ions 9 and 10 which at the sides 11 conform upproxinmtely to the diometer of the tube before inflation. Those inter roectiug teeth are preferably well tapered rom base to tip and the interspaces may be equal tool greater than the thickness of the teeth accordin r to the weight to be imposed upon the tire bu the following essential features must be insured viz, that when the tube 2 is inflated and the rings 7 and 8 drawn apart the teeth of the two rings must be clear of con tact with one another, and that when the air is withdrawn lrom the tube, as in a condition of puncture, the tips of the teeth must contact with the opposing ring to all'ord material support against oolle se, and in the heavier tires the tapered si es of the teeth where it is cemented to them and the denticu lations owing to the taper of their sides from tip to base will normally be free from one another, so that the tire is to all intents and pur oses depending simply on the air cushion wit in it foriits resilience; but When from any cause the compressedair whichinflated the tube is withdrawn the tube 2 will merely shrink upon the cushion core rings or the sides 11 ofthe teeth and its general cylindrical conformation will be maintained by them and the Weight instead of causing the complete flattening of the tube at the point of tread will be sustained by the solid material resistance of the core members and serious injury to the tire will be avoided.

Having now particularly described our invention and the manner of its operation, we hereby declare that what we claim as new and desire to be protected in by Letters Patent, is: p

1. As an inner tube for a pneumatic tire, the combination with an inflatable tube ring of flexible elastic air tight material, of a den ticula'ted ring cemented round the tread of the tube on the inside and a corres 'onding denticulated ring on the diamet'rical y opposite side of the tube the denticulations of the two rin s interproj'ectin'g and the conformation of t e inner cemented rings and the sides of the denticulations a proximating to the inner conformation of t e tube before inflation.

2. As an er tube for a pneumatic tire,

the combination with an infiatable tube ring of flexible elastic air tight material, of means for reventing the collapse of the tubeupon itse f when not inflated such means comprising core rings of rubber or other suitable'ma terial cemented to the inside, of the tube roilnd the tread and diametrically opposite, said rings each provided with lHtGIPI'OJGCtiIl teeth the adjacent sides ofwhich are tapere from base to tip the conformation of the core rings and their denticulations conforming when together ap roximately to that of the tube when not in ated.

3. As an 'inner tube for a neumatic tire, a

the combination witlvan in atable tube of elastic material, a core ring secured around the inside of the tread portion of the tube, a similar'ring secured diametrically opposite on the inner side of the tube, the core rings conforming approximately to the inside of i the tube when not inflated and the sides of said core rings bein free'from attachment to the/tube so that t e tube is free to inflate laterally from the rings. I

4. As an inner tube for a neumatic tire, the combination with an inflatable tube of flexible elastic materiaL-a core ring cemented round the inside of vthe tread portion of the tube, a similar ring similarly secured diametrically opposite on the inner side of the tube, the core rings conforming approximately to the inside of the tube when not inflated and the sides of said core rings'being free from attachment to the tube so that the tube is free to inflate laterally from the rings.

In testimony whereof we have signed our presence of 

